Passage cross-references.

And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also:

Circumcise therefore the foreskin of your heart, and be no more stiffnecked.

And he gave him the covenant of circumcision: and so Abraham begat Isaac, and circumcised him the eighth day; and Isaac begat Jacob; and Jacob begat the twelve patriarchs.

Then Zipporah took a sharp stone, and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband art thou to me.

And when a stranger shall sojourn with thee, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.

And Joshua made him sharp knives, and circumcised the children of Israel at the hill of the foreskins.

And Saul said, Thus shall ye say to David, The king desireth not any dowry, but an hundred foreskins of the Philistines, to be avenged of the king’s enemies. But Saul thought to make David fall by the hand of the Philistines. …

And David sent messengers to Ishbosheth Saul’s son, saying, Deliver me my wife Michal, which I espoused to me for an hundred foreskins of the Philistines.